refactor(domain-manager): simplify frontend URL configuration (#10194)

Replaced multiple environment variables for frontend URL construction
with a single FRONTEND_URL variable. This change reduces complexity and
improves clarity by consolidating frontend URL handling into one source.
Updated relevant validations and removed unused variables like
FRONT_PROTOCOL and FRONT_PORT.

Fix #10016

packages/twenty-server/src/engine/core-modules/environment/environment-variables.ts

@@ -551,11 +551,11 @@ export class EnvironmentVariables {
 
   @EnvironmentVariablesMetadata({
     group: EnvironmentVariablesGroup.ServerConfig,
-    description: 'Domain for the frontend application',
+    description: 'Url for the frontend application',
   })
-  @IsString()
+  @IsUrl({ require_tld: false, require_protocol: true })
   @IsOptional()
-  FRONT_DOMAIN?: string;
+  FRONTEND_URL: string;
 
   @EnvironmentVariablesMetadata({
     group: EnvironmentVariablesGroup.ServerConfig,
@@ -566,23 +566,6 @@ export class EnvironmentVariables {
   @ValidateIf((env) => env.IS_MULTIWORKSPACE_ENABLED)
   DEFAULT_SUBDOMAIN = 'app';
 
-  @EnvironmentVariablesMetadata({
-    group: EnvironmentVariablesGroup.ServerConfig,
-    description: 'Protocol for the frontend application (http or https)',
-  })
-  @IsString()
-  @IsOptional()
-  FRONT_PROTOCOL?: 'http' | 'https' = 'http';
-
-  @EnvironmentVariablesMetadata({
-    group: EnvironmentVariablesGroup.ServerConfig,
-    description: 'Port for the frontend application',
-  })
-  @CastToPositiveNumber()
-  @IsNumber()
-  @IsOptional()
-  FRONT_PORT?: number;
-
   @EnvironmentVariablesMetadata({
     group: EnvironmentVariablesGroup.Other,
     description: 'ID for the Chrome extension',